Gas pressure regulator

1. A gas pressure regulator comprising: a main body having a first, gas inlet pipe and a second, gas outlet pipe; a calibrated gas passage through which the gas flows from the first pipe to the second pipe; a shutter housed at least partially in the main body and mobile to adjust the opening of calibrated passage between an end position in which the passage is fully open and an end position in which the passage is closed; the shutter, when at the closed end position, engaging with a locating groove; a silencing element located at the calibrated passage to reduce the noise produced inside the pressure regulator, the silencing element comprising a substantially cylindrical wall having a plurality of openings through which the gas passes; and at the gas passage, an axially symmetric body for housing the silencing element, the axially symmetric body comprising a peripheral wall with a plurality of windows through which the gas passes, and the locating groove being integral with the axially symmetric body.

2. The pressure regulator according to claim 1 , wherein the axially symmetric body comprises an annular portion extending from the peripheral wall towards the inside of the body itself, the annular portion forming the locating groove.

3. The pressure regulator according to claim 2 , wherein the annular portion comprises an annular cavity which accommodates the lower edge of the cylindrical wall of the silencing element.

4. The pressure regulator according to claim 1 , wherein the silencing element is removably housed in the peripheral wall of the axially symmetric body.

5. The regulator according to claim 4 , wherein the silencing element has a break in its circumference designed to enable the silencing element to be elastically deformed so as to reduce its circumferential dimension.

6. The regulator according to claim 5 , wherein the silencing element, when elastically deformed, is inserted into the peripheral wall of the axially symmetric body.

7. The pressure regulator according to claim 6 , wherein the silencing element exerts an elastic force in a substantially radial direction against the peripheral wall of the axially symmetric body.

8. The regulator according to claim 1 , wherein the silencing element is made from sheet metal and the openings for the passage of the gas are circular holes.

9. The regulator according to claim 1 , wherein the silencing element is made from rigid wire mesh.

10. The regulator according to claim 1 , wherein the silencing element is made of ceramic material.

11. The regulator according to claim 1 , wherein the silencing element is made of plastic.

12. The regulator according to claim 1 , where the shutter is slidably housed in a cylindrical liner stably fixed to the main body, wherein the axially symmetric body is positioned between the liner and a portion of the main body in such a way that the gas flowing from the calibrated passage is forced to follow a well-defined path.